在ORACLE的存储过程中如何做简单的动态查询

CREATE OR REPLACE procedure ZXM_SB_GZ_GET
(p_table in varchar2,
p_name in varchar2,
p_value in varchar2,
outpara out lntxdba.zxm_pag_cs_power.c_type
)
as
begin
declare
wherevalue varchar2(200);
begin
wherevalue:='select * from '||p_table||' where '||p_name||'='||p_value;
open outpara for
wherevalue;
end;
end;